Merge from bittboy/buildroot@db180c0

support/dependencies/check-host-cmake.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# prevent shift error
+[ $# -lt 2 ] && exit 1
+
+major_min="${1%.*}"
+minor_min="${1#*.}"
+
+shift
+
+for candidate; do
+
+    # Try to locate the candidate. Discard it if not located.
+    cmake=`which "${candidate}" 2>/dev/null`
+    [ -n "${cmake}" ] || continue
+
+    # Extract version X.Y from versions in the form X.Y or X.Y.Z
+    # with X, Y and Z numbers with one or more digits each, e.g.
+    #   3.2     -> 3.2
+    #   3.2.3   -> 3.2
+    #   3.2.42  -> 3.2
+    #   3.10    -> 3.10
+    #   3.10.4  -> 3.10
+    #   3.10.42 -> 3.10
+    # Discard the candidate if no version can be obtained
+    version="$(${cmake} --version \
+               |sed -r -e '/.* ([[:digit:]]+\.[[:digit:]]+).*$/!d;' \
+                       -e 's//\1/'
+              )"
+    [ -n "${version}" ] || continue
+
+    major="${version%.*}"
+    minor="${version#*.}"
+
+    if [ ${major} -gt ${major_min} ]; then
+        echo "${cmake}"
+        exit
+    elif [ ${major} -eq ${major_min} -a ${minor} -ge ${minor_min} ]; then
+        echo "${cmake}"
+        exit
+    fi
+done
+
+# echo nothing: no suitable cmake found
+exit 1